/*
 * Copyright 2013-2018 Lilinfeng.
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.phei.netty.protocol.netty.client;

import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

import com.phei.netty.protocol.netty.MessageType;
import com.phei.netty.protocol.netty.struct.Header;
import com.phei.netty.protocol.netty.struct.NettyMessage;

/**
 * 请求：心跳处理器
 */
public class HeartBeatReqHandler extends ChannelHandlerAdapter {

	private volatile ScheduledFuture<?> heartBeat;

	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
		NettyMessage message = (NettyMessage) msg;
		
		// 握手成功，主动发送心跳消息
		if (message.getHeader() != null 
				&& message.getHeader().getType() == MessageType.LOGIN_RESP.value()) {
			//握手请求成功后，启动无限循环定时器用于定期发送心跳消息
			heartBeat = ctx.executor().scheduleAtFixedRate(
					new HeartBeatTask(ctx), 0, 5000,TimeUnit.MILLISECONDS);
		} else if (message.getHeader() != null 
				&& message.getHeader().getType() == MessageType.HEARTBEAT_RESP.value()) {
			
			System.out.println("Client receive server heart beat message : ---> " + message);
		} else {
			ctx.fireChannelRead(msg);
		}
	}


	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
		cause.printStackTrace();
		if (heartBeat != null) {
			heartBeat.cancel(true);
			heartBeat = null;
		}
		ctx.fireExceptionCaught(cause);
	}
	
	private  class HeartBeatTask implements Runnable {
		
		private final ChannelHandlerContext ctx;

		public HeartBeatTask(final ChannelHandlerContext ctx) {
			this.ctx = ctx;
		}

		@Override
		public void run() {
			NettyMessage heatBeat = buildHeatBeat();
			System.out.println("Client send heart beat messsage to server : ---> " + heatBeat);
			ctx.writeAndFlush(heatBeat);
		}

		private NettyMessage buildHeatBeat() {
			NettyMessage message = new NettyMessage();
			Header header = new Header();
			header.setType(MessageType.HEARTBEAT_REQ.value());
			message.setHeader(header);
			return message;
		}
	}
}
